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| author | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
| commit | 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch) | |
| tree | 6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/thread/__lock.c | |
| download | musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.gz | |
initial check-in, version 0.5.0v0.5.0
Diffstat (limited to 'src/thread/__lock.c')
| -rw-r--r-- | src/thread/__lock.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/thread/__lock.c b/src/thread/__lock.c new file mode 100644 index 00000000..557c6a62 --- /dev/null +++ b/src/thread/__lock.c @@ -0,0 +1,12 @@ +#define SYSCALL_RETURN_ERRNO +#include "pthread_impl.h" + +void __lock(volatile int *l) +{ + int spins=100000; + /* Do not use futexes because we insist that unlocking is a simple + * assignment to optimize non-pathological code with no contention. */ + while (a_xchg(l, 1)) + if (spins) spins--, a_spin(); + else syscall0(__NR_sched_yield); +} |